The reference frame of visual motion priming depends on underlying motion mechanisms
The reference frame of visual motion priming depends on underlying motion mechanisms
复制标题
DOI：
10.1167/14.1.10
复制
发表时间：
2014-01-01
影响因子：
1.8
通讯作者：
Takeuchi, Tatsuto
中科院分区：
文献类型：
--
作者：
Yoshimoto, Sanae;Uchida-Ota, Mariko;Takeuchi, Tatsuto
几种不同类型的运动机制在人类视觉系统中起作用。本研究的目的是澄清类型的参考框架，如视网膜和空间的参考框架，在这些不同的运动机制的功能。为了实现这一点，我们使用了一种称为视觉运动启动的现象，其中一个方向模糊的测试刺激的感知方向是由前一个刺激的移动方向的影响。先前的研究表明，负性运动启动是由低级运动机制（如一阶运动传感器）引起的，而正性运动启动是由高级运动机制（如特征跟踪系统）引起的。在实验中，受试者在平稳漂移的启动刺激终止后进行扫视，并判断随后在视网膜或基于屏幕的空间坐标中呈现的1808相移正弦波光栅的感知方向。通过操纵刺激参数，如启动持续时间，速度，和对比度，积极和消极的启动进行了观察。我们发现，积极的启动观察空间位置坐标，而负启动观察视网膜位置坐标。只有当启动和测试刺激之间的间隔长于约600 ms时，才观察到在空间坐标中的突出的正启动。这种延迟启动效应不是由扫视眼球运动引起的。这些结果表明，低级运动机制在视网膜位置坐标中起作用，而高级运动机制在空间位置坐标中起作用，其中表示建立得很慢。
Several different types of motion mechanisms function in the human visual system. The purpose of this study was to clarify the type of reference frame, such as retinotopic and spatiotopic frames of reference, at which those different motion mechanisms function. To achieve this, we used a phenomenon called visual motion priming, in which the perceived direction of a directionally ambiguous test stimulus is influenced by the moving direction of a preceding stimulus. Previous studies have indicated that negative motion priming is induced by a low-level motion mechanism, such as a first-order motion sensor, whereas positive motion priming is induced by a high-level motion mechanism, such as a feature-tracking system. In the experiments, subjects made a saccade after the termination of a smoothly drifting priming stimulus and judged the perceived direction of a 1808 phase-shifted sine-wave grating presented subsequently in retinotopic or screen-based spatiotopic coordinates. By manipulating the stimulus parameters, such as primer duration, velocity, and contrast, both positive and negative priming were observed. We found that positive priming was observed in spatiotopic coordinates, whereas negative priming was observed in retinotopic coordinates. Prominent positive priming in spatiotopic coordinates was observed only when the interval between the priming and test stimuli was longer than around 600 ms. This delayed priming effect was not caused by saccadic eye movements. These results suggest that a low-level motion mechanism functions in retinotopic coordinates, whereas a high-level motion mechanism functions in spatiotopic coordinates, in which the representation builds up slowly.